Machine for making machine-screws



6 Sheets-Sheet 1.

W. H. EDDY. Machine for Making Machine Screws. No. 228,989.

Patented June 22,1880.

In r/e nta r.

".FETERS, FHOTO-LITHOGRAPMER. WASBINGTON D C.

- GSheets-Sheet'Z. W H. EDDY.

Machine for Making Machine Screws.

No. 228,989. Patented June 22,1880.

NFETERS, FHOITU-LITNOGRAFNER. WASHINGTON. v

W I ssheets sheet 8. Machine for Making M hi Screws. No. 228,989;

Patented June 22, I880.

PETERS. PHHTO-LITNOGRAF'NER, WASHINGTON. D c.

v 6 Sheath-Shani; 4. W. EL -EDDY. Machine for Making Machine Screws. No. 228,989. Patented June 22,1880.

j /wgii f N.FETERS, PHOTO-LITHDGRAPHER, WASHINGTON. D. O.

6 Sheets-Sheet W. H. EDDY. Machine for Mak'ing Machine- Screws. No. 228,989.

Patented June22, 1880.

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Inve 6 1 ill'am N. PUERS. PHOTOVUTMOGRAPNER. WASWNGTQII. D\C

6 Sheets-Sheet 6;

W. H. EDDY. Machine for Making Machine Screws. No. 228,989. Patented June 22,1880.

[hr/"en ton "1 fi i s, PHOTO-HTHOGrlAPHER, WASI-HNGTON. D C.

UNITED STATES PATENT Orricso WILLIAM H. EDDY, OF WORCESTER, MASSAGHUSFiTTS.

MACHINE FOR MAKING MACHINE-SCREWS.

SPECIFICATION forming part of Letters Patent No. 228,989, dated June 22, 1880.

Application filed J mm 7, 1879.

To all whom it may concern:

Be it known that I, WILLIAM HENRY EDDY, of the city and county of Worcester, and State of Massachusetts, have invented a new or Improved Machine for Making Machine-Screws and 1 do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which Figure 1 is a top view, Figs. 2 and 3 opposite side elevations, Figs. 4 and 5 opposite end views, and Fig. 6 a longitudinal section, of it.

The remaining figures necessary to properly illustrate my invention are hereinafter duly mentioned.

This machine is an automatic one, inasmuch as without the intervention of human hands or labor it performs the operations of shaving or trimming the head of each blank, nicking such head, reshaving or finishing it, transferring the blank to threading mechanism, and

while so transferring it turning it over end for end, and finally threading and dischargin git.

Fnrtliernioraby this machine a series of blanks are being operated on synchronously that is to say, while one is being fed in another is being shaved, another is being nicked, another reshaved, another transferred to the threading mechanism, and another is being threaded and discharged from the machine.

The nature of my invention is fully set forth and defined by the claims hereinafter pre sented.

In the drawings, A denotes the bed-frame of the machine, supporting two movable heads, B O, and two stationary heads, D E, these latter heads being between the two heads B 0, each of which is so adapted to the bedframe as to be movable thereon lengthwise of it. Above the said heads is the driving-shaft F, which, as shown in the drawings, is sustained in hearings in two standards, G H, projectin g upward from the bed-frame.

\Vithin the head B is a shaft, I, which is provided with two series of radial arms, a, arranged with it, as shown, they serving to support a series of four spindles, K, arranged parallel to and around the shaft I at equal distances apart from each other and from such shaft.

Fig. 7 is a longitudinal section of one of such spindles, all of which are alike in construction, and each is furnished with a pair of levers, b b, carrying jaws c c at or near their outer ends, such being as shown. Another pair oflevers, cl (1, arranged with the levers b b, and in the spindle, as represented, co-operate with said levers b b in a manner to aid in moving them, so as either to move the jaws toward or apart from each other. "There is properly applied to each lever d and to the spindle a spring, a to move the longer arm of the lever outwardly as occasion may require. There is on each spindle, and surrounding it and the longer or oblique arms of the levers d, a collar, f, which, at its middle, is provided with a flange, g, projecting from it, as shown. On the collar being moved back ward on the spindle such collar, by acting against the said oblique arms, will cause the jaws to close upon a blank and hold it firmly when between them, the springs on the collar being moved the opposite way, serving to cause or aid in causing the jaws to move apart, so as to release their hold on the blank.

The shaft I has mechanism for-imparting to it an intermittent rotary motion, such being thus described.

Arranged in hearings in the head 0 is a tubular shaft, Zt, to which are fixed two pulleys, i It. By the side of the larger of such pulleys--viz., that marked 7cis another pulley, 3 of like diameter, which, with a small gear, m, is fixed on a short tubular shaft, Z, that turns loosely on the shaft h. The gear m engages with'a larger gear, 0, by means of an intermediate gear, a, such gear 0 being fixed on a tubular shaft, L, which is on and concentric with a cam-shaft, M, arranged as shown.

Fixed on the shaft M is a cam, 19, which works against a stud, q, projecting from a sectoral gear or lever, r, whose are of teeth eni gages with a gear, 8, which is free to revolve on shaft I. The lever 4", near its outer end, is pivoted to an arm, t, projecting from the movable head B. The gear 8 has a grooved hub,

u, projecting from one side of it, and it also has a stud, 11, extending from its opposite side, such stud being to co-operate with a notched wheel, to, fastened on the shaft I. A vertical section of .such notched wheel and the parts over it is shown in Fig. 8. The wheel has four holes, 00, and four notches, 1 arranged in it, as represented, the holes being at equal distances apart, and to receive in succession the stud o. The"per-ipheral notches .are also at equal distances apart, and besides them there is in the circumference of the wheel to a groove, 2, that extends entirely around the wheel and receives a continuous rib projecting into it from a furcated friction-brake, a, which, arranged as shown, is supported by a screw, 1), projecting from the head B into a short slot, 0, made vertically in the brake. Above the said brake is a screw, (7, which is screwed up into a tubular projection, e, of the head B. By means of the said screw the pressure of the brake on the wheel '20 may be regulated as occasion may require, to prevent the shaft I and its spindles by their momentum from being carried around too far for a bolt, f, to properly enter a peripheral notch of the said wheel. This bolt, adapted to slide vertically in a bracket, 9, rests on the end of a screw, h, which is screwed through the inner arm of a lever, i, which, pivoted to the head B and arranged as shown, has its other arm resting on a cam, k, fixed on the cam-shaft M. The said cam and lever operate to force the bolt upward, so as to cause it to lock the wheel, and consequently the shaft I, as often as may be necessary.

A furcated lever, 11, arranged in the bracket g, as shown, and pivoted thereto, enters the groove of the hub to of the gear 8. Such lever, at its lower part, enters a slot, m, in an arm, n, projecting from a vertical shaft, 0, which turns freely in the arm, and at its upper part has fixed to it one of two toggles,p q. The toggle q is pivoted to the head B, and with the toggle p is jointed to a pitman, 1', carried by a bent lever, s, which is pivoted on a stationary arm, 15, projecting from the head 13. The lever s is moved by a grooved cam, it, which is fixed on the cam-shaft M and formed as represented in Fig. 4. q

The shaft ois supported by and so as to revolve freely in two arm s, o o, projecti n g from a vertical tubular shaft, w, that turns on a journal, as, extending up from the arm t. Furthermore, the shaft 0 extends through a fnrcated head, 1 (shown in top view in Fig. 9,) such head being slitted, as shown at z, to receive the shaft. This head is fixed to a rod, (F, that slides in the shaft I, which has on its outer end a stop or nut, b

On the shaft I is a short sleeve, 0 from which a screw, d projects through a slot, 0

-made lengthwise in the shaft I, such screw being screwed into-the rod a Encompassing the sleeve 0 is a grooved pulley, which should turn freely on the sleeve and be so otherwise applied to it as to move endwise with it in either direction.

Each of the spindles K has a driving-pulley, g fixed 011 it. Furthermore, there are two loose pulleys, h k which revolve on stationary journals projecting from the head B, such loose pulleys being arranged as represented in Figs. 1, 2, and 3.

An endless belt, i arranged with the pulleys of the spindles and .around a drum or pulley, k fixed on the driving shaft, serves to impart rotary motion to the said spindles. The belt also goes around a guide-pulley, Z that is pivoted and slides freely on a stationary journal, m arranged as shown. I so apply the journal to the frame as to be movable laterally thereon in order to effect tightening of the belt,a set-nut, "n being employed to clamp the journal to the frame.

By the employment of the pulleysf and Z arranged as shown, with the endless belt 6 applied to them, the driving-pulley k and the pulleys g g ,in manner as represented, the spindles of the latter pulleys are caused to revolve in opposite directions, in order for the shaving-tools to properly operate on the blanks.

The cam a, in revolving, moves the bent lever s so as to operate the toggles in a manner to cause the rod a to be drawn back within the shaft I, whereby the grooved pulley f will be moved endwise, so as to shift the endless belt 7? from the pulleys g to and upon the loose pulleys h 11?, such being in order to enable the series of spindles to be revolved ninety degrees of a circle, such rotary movement of them being effected by the cam 11, sectoral gear-lever r, and the gear 8. The said gears will previously have been moved into engagement with the notched wheel 10, fastened on the shaft I, in order for the gear to revolve the shaft a quarter of a revolution.

In the upper part of the head B is a sliderod, 0 which is connected with the vertical shaft 0 by a link, f, jointed to them, whereby, when the shaft is moved by the toggles, the

slide-rod will be moved longitudinally. There is fixed on the slide-rod, at its inner end, a notched head or projection, q", to receive, in succession, the flanges g of the collars f, from which it will be seen that, while the rod 0 and its notched head may be in movement, the collar whose flange may be in engagement with the said head will be correspondingly moved, thejaws being closed when the collar is inoved back on the spindle and opened when the collar is moved the opposite way.

The collars are successively brought around into engagement with the notched head of the slide-rod, the jaws of the spindle of each collar remaining closed while the collar may be out of the head.

The next parts of the machine to bedethe next adjacent surface of the sustainingarm a. On the opposite side of the said arm, and between it and the driving-pulley g of the spindle, is a collar or short sleeve, .9 which projects within the pulley, and is kept from revolving 011 the spindle by a stud, t which extends from the pulley into the said collar.

Fig. 10 is a vertical section of the pulley and collar, it being taken through the stud. Fig. 11 is a similar section taken through the helical springs a a intervening between the collar and pulley. These springs ed, in consequence of the pulley being fastened to the spindle by a set-screw, v press the collar against the arm a and the pulley in the opposite direction, so as to insure the shoulder 1 being kept closely up to the arm in order for the head of the screw-blank to be suitably presented to the shaving and reshaving tools. The collar has two studs, 20*, projecting from its periphery at opposite points thereof, as shown, Fig. 12 being an outer side view of the collar. These studs are to operate with two stationary cams, m g arranged as shown, and particularly in Fig. 13, which is a transverse section ofthe machine, taken through such cams. 0n the belt being shifted oif the driving-pulleyof the spindle one of the studs n2 while the shaft I may next turn the set of spindles a quarter of a revolution, will be carried against one of the cams, and in consequence thereof the rotary motion of the spindle on its own axis will be stopped, and the spindle will be next turned into a proper position, whether for its blank being nicked or being taken and suitably presented to the jaws, which sustain it while it is in the act of being threaded, as such jaws should grasp it at the termini of the nick instead of grasping it at points at right angles to the nick or between its termini. The said jaws must hold the head of the blank with great pressure on it in order to prevent the blank from being revolved in them by the threading-tool, and it will be easily seen that, were they to grasp the head at points of its circumference at right angles to the nick, the head might be contracted crosswise of the nick. By grasping the head at the ends of the nick such contraction of it by the jaws is prevented. By having the two cams 00 1 arranged as described a screw-blank, after having been nicked and reshaved, will be adjusted so as to bring its nick into parallelism with the direction it had while being made by the nicking tool or saw.

Fixed to the standard or stationary head D is a hopper, N, so applied to. the standard as to be movable thereon horizontally and rectilinearly lengthwise of the machine, and to be fixed'in place by a set-screw, 2 The spout of the hopper is shown at a as of the usual kind used in screw-machines, and as provided with the mechanism for removing the blanks successively from it and carrying thein down to the uppermost of the spindles for being introduced between its jaws, such mechanism being the blank-clearer b and the seizing and carrying arm 0 and their operative mechanism. 1 have, however, within the hopper useful devices for picking up the screw-blanks and ar ranging them and presenting them to the spout.

Within the hopper is a rotary circular segment or feeder, 0, which is formed as shown in Fig. 14, which is a top view of it, and in Fig. 15, which is a side view, and in Fig. 16, which is a .longitudinal section ofit, and in Fig. 17, which is an end view of it. It is grooved in its chord lengthwise, as shown at d", to receive the shanks of the blanks, and is hooked at one end of the chord, as represented at 0 At the opposite end of the chord there is to the segment a shield, f which, shaped as shown, prevents the blanks taken up from being disturbed by those in the hopper during the reciprocating rotary movements of the feeder.

The feeder O is fixed on a horizontal shaft, 9 provided. with a pinion, 7L3, that engages with a toothed rack, i sustained in a rockerhead, 76*. From the foot of the rack a rod, 1 extends and is pivoted to a crank, m applied to the arbor of a bevel-gear, M, such gear engaging with another such gear, 0 carried by the camshaft M.

Fig. 18 exhibits a rear face view of the bevelgear a and the crank m The crank is formed, as shown, to clasp the gear-arbor p and is provided with a screw, (1 to contract it upon the said arbor with friction sufficient for it to be revolved with the arbor. The object of so applying the crank to the arbor is to prevent breakage of the gear or rack teeth should the feeder become caught or so clogged in the hop per as not to readily turn therein, the mechanism imparting to the said feeder reciprocating rotary movements in the hopper.

We will now suppose that a blank has been removed from the hopper-spout by the clearer and seized between and by the prongs of the carrying-arm c (a side view of which is shown in Fig. 19) and carried downward to a proper position for being introduced between the jaws of the uppermostspindle. A slider, r adapted to slide lengthwise in the bracket .9 projecting up from the head or standard E, is employed to push the blank, shank foremost, between the jaws. This slideris driven forward by a wedge, 25, and retracted by a spring, '16, suitably applied to the slider. The wedge ex tends through the bracket, a horizontal section of which, with the slider and wedge, is given in Fig. 20. In its rear a screw, n is screwed in to the bracket and against the wedge, 1

being moved endwise within the shaft z, but cause the shaft M, when in revolution, to revolve the tubular shaft.

The two heads B O are movable rectilinearly endwise on the bed-frame A and relatively to the shaft M, in order that the mechanism of such frame may be properly adjusted as the lengths of the screw-blanks to be operated on from time to time'may require.

The clearer is shown in edge view in Fig. 21 and in side elevation in Fig. 22. It is pivoted to the spout of the hopper, and has a short arm, a, extending upward from its journal, such arm being engaged with a lever, 0 by a link, I). bears against a cam, 01, fixed on the shaft 2 and is pressed up to the cam by a spring, a. By the cam, spring, lever, link, and arm, as described, the clearer derives its movements necessary for removing a blank from the spout into a position for it to be seized by the carrying-arm 0 The said carrying-arm (shown in side view in Fig. 19) projects from a shaft, f", from which an arm, g projects downward against the periphery of a cam, h, fixed on the shaft 2 the spring 0 being used to keep the arm up to the cam. By means of the said cam spring, arm, and shaft the carrying-arm c derives its movements for seizing the blank from the clearer, and after the retreat of the latter carries the blank down to the spindle, to be forced between the jaws thereof by the slider 4. After the blank may have been inserted between the jaws of the spindle and caught bythem the carrying-arm 0 is raised upward off the blank.

In each spindle, and between thejaws thereof, which are recessed to receive it, is a blank clearer, which is provided with a spring, 1 for advancing it. On the jaws being moved to release the blank it will be forced out from between them and up against the end of the slider r it being grasped by the transferrer, to be hereinafter described. While the spindle is receivinga blank such spindle is at rest, or has no rotary motion. After a blank may have been introduced into a spindle the latter has an orbital movement to carry the blank down to the rest m, by which it is supported while being shaved on its head, or the latter is properly reduced for being nicked or slitted. The shaving-tool for such purpose is shown. at a Fig. 1.

Fig. 23 is a transverse section of the machine, it being taken through the arbor of the nicking-saw. It shows the mechanism for shaving and reshaving the blank.

A view of the inner end of the shaving-tool is shown in Fig. 24. This tool is supported in an arm, 0 projecting from a rock-shaft,p whose journals are supported in bearings sustained by a bracket, g

Fig. 25 is a longitudinal and vertical section of the rock-shaft and its supporting-bracket.

One journal of the rock shaft turns in a bearing, 1*, which projects from the bracket,

The lower arm of the said leverand is held thereto by a clamp screw, .9 and nut t The other journal turns in a screw, 41/, that screws into a box, 0 a front view of which and the screw is givenin Fig. 26. This box has a journal, w, projecting up from it and provided with a clamp-screw and nut, as shown at 00 such serving to confine the Lox in place in the bracket, a top view of which is given in Fig. 27, which shows the opening gj for receiving the journal of the box. There is a screw, 2 screwed into the rock-shaft to connect it with the adjusting-screw a, which at its inner end abuts against the journal-shoulder 01. The rook-shaft is adapted so as to slide endwise in its bearings 1, it being adjusted by the screw 20*, so as to bring the shaving-tool into a proper position for cutting the blank.

By means of the opening 3 and the journal and clampscrew and nut thereof, the shaft may be adjusted either into parallelism with or a little oblique to the shaft 1, as occasion may require, to cause the shaving tool to operate to advantage on the head of a screwblank.

A spring, b applied to the arm 0 serves to raise it. From sncharm a pitman, 0 projects upward into and bears in a screw, 01*", screwed through an arm, 6 projecting from a short rock-shaft, f From this rock-shaft an arm, 9 extends downward and is jointed to a bar, If, which is also jointed to one arm of a triarmed lever, i whose outer lower arm is provided with a stud, 70 to work against the periphery of a ean1,l fixed on the tubular-shaftz Fig. 28 is a side view of the arm g bar If, tri-armed lever i cam 1 and also'another or forked arm, m which extends down from another rock-shaft, n arranged as shown. The arm m is pivoted in its fork toone arm of the said tri-armed lever.

By means of the cam 1 lever 1, bar h and arm 1 rock-shaftf arm 0 and pitman c the shaving-tool is moved down gradually upon the blank to give form to its head.

The reshaving-tool shown at n is like the shaving-tool a and is supported and operated by similar appliances-viz, an arm, 0 rock-shaft p bracket 1 bearings r 12 adjustingscrew a", spring b pitman a, screw d arm 9 rock-shaft n, and the forked arm m The screws d d directly over the two pitmen are for regulating the depth of cut of the shaving and reshaving tools into the blankheads in order to make them of such diameters as may be required.

Furthermore, the reshaving mechanism has its restm like the rest in of the shaving mechanism, each of such rests being fixed to one of two pivoted arms, n 11?, arranged as shown, each being provided with a projection, 0 as represented, to play into and out of recesses 19 19 formed, respectively, in two jawed slides, q" Q15, adapted to the stationary head 1), so as to slide horizontally therein toward and from each other. These slides are provided with jaws r r to grasp the blank by its shank and hold it firmly while it may be in the act of being nicked. There is applied to the slides a spring, 8 to force them asunder.

Each of the rests in and m is applied so as to be adjustable lengthwise in its carrier or arm, 02 and is provided with screws t t tggconfine and adjust it in place in the arm.

Fig. 29 is a rear view of the rest and its carrier, while Fig. 30 is a section through both, showing the screws, and particularly the lower one, which is conical at its inner end, the conical surface of the conical part bearing against the lower end of the rest. The lower screw thus serves to force the rest upward in its carrier and the other screw to clamp it in place, as occasion may require, the carrier being slotted to receive the shank of the screw last named.

The mechanism for closing the jaws r may now be described.

In rear of each slide is a cam, 00 which is adapted-to an arm, g so as to be adjustable lengthwise thereon. Fig. 31 is a horizontal section of the cam and arm with their" adjusting and clamp screws Z5 The arm g isattached to a short shaft pivoted in the head D, and provided with a gear, b", which engages with one set of teeth of a duplex rack, 0 formed as shown in side view in Fig. 32, and adapted to slide lengthwise on the head D. One set of teeth of the rack comes below and the other above its pinion, as shown in Fig. 32, and there is to the rack a stud, al to bear against the periphery of a cam, 0", fixed on the tubular shaft 2 A spring, f arranged as shown, serves to keep the stud up to the cam, and with it to move the duplex rack. Thus, by means of the cam, the duplex rack, and the gears of the pivotal shafts of the two cams 00 the slides (1 are moved toward each other. During such movements they so act against the two rest-carrying arms n n as to force and hold them upward in order to bring the two rests m m up into positions for supporting the blanks. While the slides q. q are being moved apart the arms n 41 drop downward, so as to carry their rests out of the orbital path of the screw-blanks in order for the spindles to be revolved a quarter of their orbital revolution.

The nicking-saw is shown at g as fixed on the top of a vertical shaft,-h, which is journaled in a carriage, t supported by the head E, so as to be movable a short distance length wise .of the machine. A bevel-gear, k fixed on the shaft h engages with anothersuch gear, 1 fixed on a horizontal shaft, m", journaled in the carriage i and extending through a box, fixed to the bed-frame. The shaft m slides freely in the box, and is provided with a gear, a, to engage with the gear 0 by means of an intermediate gear, 0

From the above it will beseen how the nicking-saw is revolved.

There is applied to the carriage of the nicking-saw mechanism for advancing such carriage so as to cause the saw to cut the proper distance into the head of the blank, and the carriage also has applied to it a spring, 19", for retracting it.

The mechanism for advancing the carriage is as follows, it being shown in top view of Fig. 33: It consists of a wedge, g and mechanism for moving it opposite ways between a bearing, 4, fixed to the carriage, and an adjustable abutment, 8 adapted to revolve in the head E, on which there is an adjustingscrew, F, for advancing the abutment, all being as shown in Fig. 33. The wedge g is jointed to a bent lever, a (see Fig. 3a,) which is provided with a stud. 0 to bear against a cam, 1 0 fixed on the tubular shaft z. As the cam is revolved with and by the shaft the wedge will be advanced, it being retracted by a spring, 00 suitably applied. After the screw-blank may have been nicked it is next moved to the reshaving mechanism, which takes off the burr produced by the nickingsaw and finishes the head. Having been thus finished, the blank is moved another quarter of its orbital revolution and brought up into position to be transferred to the threading tool by mechanism which may next be explained. This mechanism, during the passage of the blank to the threader or the jaws for holding the blank for being threaded, not only turns the blank end for end, but moves it lengthwise in the transferrer and adjusts it so that its head may properly enter between the said jaws.

Fig. 35 is a top view, and Fig. 36 a frontend view, of the transferrer T, while Fig. 37 is a vertical section of the transferrer and its operative mechanism. It projects from one end of a long pinion, 1 which turns on a stationary tubular shaft, to", through which the sliderod 10 hereinbefore mentioned, passes.

A helical spring, a, suitably applied to the shaft a and to the pinion, operates to move the pinion back on its shaft preparatory to areturn movement of the transferrer.

A toothed rack, b adapted to slide vertically in the head E or a projection therefrom, slides on a slide-rod, c and between and against two helical springs, d 6, adapted to the rod, (see Fig. 38,) which is a--vertical section of the rod and rack. From the rod an arm,f extends, and has a stud, to rest on a cam, h, fixed on the tubular shaft 2 There is a spring, i applied to the arm f to pull down the rod 0 and the rack.

From the above it will be seen that by means of the rack and pinion, the slide-rod, and its arm and the cam, as just described, the transferrer is moved or advanced, it being drawn back by means of the spring.

With the transferrer the adjuster U co-operates. It is a stationary curved horn or cam, arranged as shown. While the screw-blank is being moved forward by the transferrer the head of the blank rests and moves against the upper curved edge of the adjuster, which moves the blank endwise in the transierrer, so

as to bring the head of the blank into the proper position to enter the jaws 70 70 by which it is next grasped, such jaws being arranged in the head E in manner as shown in part in Fig. 6 and in horizontal section in Fig. 38 and in vertical section in Fig. 39, this latter figure representing the mechanism for closing the jaws.

From the transferrer there projects a stud, l, which at each of the extremes of motion of the transferrer brings up against one of two screws m m or adjustable stops projecting up from the head E. These stops determine the positions the transferrer is to take for receiving and discharging a serew-blank. It was before stated that the rack b is supported at its ends against springs d 6 These springs yield and prevent the rack and pinion teeth on the transferrer from being overstrained or broken when the stud of the transferrer is on either of the stops.

Each spring, by being forced against the rack, not only aids in moving the rack, but performs the office of maintaining the transferrer-stud in close contact with one of the stops, while such stud is to rest thereon.

On the upper spring is a nut, a, which is screwed on the rod 0 against the spring, and serves to regulate the pressure of both springs on the rack between them.

The jaws k k slide toward and away from one another within the head E, and have a spring, n applied to them for forcing them apart, they being also provided with mechanism for closing them.

To the jaws there are applied by screws 0 as shown, two levers, p 12 which at their lower ends are pivoted to two toggles, u u",

which are pivoted to a gear, Q8, that engages with a toothed sectoral lever, r". This lever has near its outer end a stud, to rest against the periphery of a cam, t fixed on the shaft 2 In the revolution of the cam the jaws at the proper time will be closed by the action of the levers, the toggles, and the gear, and sectoral lever. The screws 0 serve to adjust the levers to the jaws as the diameter of the head of the screw-blank may require.

After the transferrer may have performed its office of transferring a screw-blank into the jaws 7c 70 it is moved aside and off the blank by means of the spring (6 The transferrer is next moved back toward the series of spindles,

and next is advanced laterally, so as to cause it to seize a blank projecting from the jaws of the uppermost spindle. Thislatter movement of the transferrer is accomplished by a forked lever, n which enters a groove, c, in the hub of the pinion 1 and has a stud, w", projecting from it and bearing against the periphery of a cam, 00*, fixed on the shaft 2.

The threader is shown at V. It projects from and extends through the tubular shaft h, and is, or should be, applied thereto by a feather connection, or devices which will admit of itbeing moved endwise in the tubular shaft and revolved by such shaft. On its outer end the threader has ahead, y, to which a spring, z, is properly adapted, as shown,.for retracting the threader. Within the threader is the tool (0 for shaping the endof the shank of the blank, the said tool being so applied to the threader as to slide lengthwise in it and be revolved with and by it.

The said blank-end shaper is either to round or taper the end of the blank or finish it in the ordinary way in which a machine-screw is generally made at the end of its shank. There is to the shaper a spring, I), for retracting it.

The machinery for advancing the threader to cause it to take upon the blank is thus described: There is pivoted to a bracket, 0 a lever, d, from which a projection, 6 extends, and rests against the head of the threader. The said lever has pivoted to it an arm, f provided with a stud, 9 to bear against a cam, h, which is clamped by a screw, 6 to a sleeve, In, which encompasses the shaft M, and is held thereto by a set-screw, L Furthermore, there is an car, an", extending down from the lever d, and provided with a screw, it", which screws into the ear and against the arm f The screw it serves to adjust the lever d to the arm f to insure the threader taking upon the end of the blank when such lever is driven forward by the lever moved by the cam.

The end-shaper, like the threader, has for moving it in a lever, 0 arm 19", adjustingscrew g and operative stud r", and cam 3 the cam being an annulus encompassing the sleevelc and held thereto by a set-screw, t all being arranged and applied as represented. The threader, after catching upon the blank, continues to revolve, and forms on the blank the screw-thread. While the thread is being made the end-shaper is driven forward against the blank and performsits duty. The threader, having done its work in making the thread,is next to be unscrewed from the blank.

By the side of the pulley Land on the tubular shaft h, is a loose pulley, 26, whose diameter equals that of the pulley i. A band, 12 runs around one of the said pulleys and a wide drum or pulley, w, fixed on the driving shaft F. Another crossed belt, x also runs on the pulleyw and on either of the pulleys k and 1 Belt-shifters 2 a fixed to the upper part of an arm, I), are applied to the two belts. The said arm b projects up from a rock-shaft, 0 pivoted to the head 0. The arm. I) carries an adjustable stud, d, (see Fig. 40,) which is a vertical section of the arm and stud, the said stud being movable in a slot, e in the arm, and provided with a screw, f and nut 9 to clampit to the arm. The stud enters a grooved cam, h fixed on the tubular shaft L, hereinbefore mentioned.

By means of the cam and lever the belt-shifters are moved simultaneously, so as to shift the belts, the crossed belt being moved from the pulley It to the pulley y, or from the latter to the former of such pulleys, as occasion may require. At the same time the other belt will be shifted from one of the pulleys t and a to the other.

The unscrewing of the threader from the blank is effected by reversing the rotary. motion of the threader, which is done when the crossed belt is on the pulley if and the other belt is on the pulley z. When the latter belt is on the pulley a and the crossed belt is on the pulley 7c the threader is revolved so as to make the thread.

In order that the cam-shaft M may be kept in revolution while the belt m is on the pulley it, there is within the pulley 3 a ratchet, 72 which engages with a pawl, carried by the pulley 7c. Figs. 41 and 42 exhibit views of the two pulleys and their ratchet and pawl. A spring, l applied to the pawl, forces it in contact with the ratchet-wheel 6 There is combined with the two shafts L and M a mechanism which, in case of clogging or irregularity of action of the mechanism by which the blanks are fed into the machine and shaved, nicked, and reshaved, and subsequen tly transferred to the jaws for holding them for being threaded, will prevent breakage of or accident to the machinery in consequence of such clogging or irregularity of action.

There is fixed on the inner end of the tubular shaft L a circular disk or head, m by whose outer side there is also another head, a", which slides lengthwise on the shaft, and has a grooved hub, 0 to receive a lever to move the head it toward or away from the head m". From the head a a stud, 0 extends through a corresponding hole in the head m the stud when the two heads are in contact being long enough to project into the groove 10 of a third head, fixed on the shaft M by a set-screw, 1' screwed into the hub of the said head g Fig. 43 is a section of the two shafts and the three heads, and Fig. 44 is an inner side View of the head q".

The groove p is circular, and has opening radially out of it a short straight groove, 3 provided with a slide, held in place by a clamp'screw, a and provided with an adjusting-screw, 22 all being as shown. The inner end of the slide is obtuse angular in shape, as represented, and within the groove p is a small roller, 10".

The slide can be adjusted so as to hold with sufficient power against the pressure of the stud the roller stationary in and relatively to the groove for the shaft M to be revolved by the stud acting against the roller, and such slide is to be so adjusted and will so hold the roller, while the machinery may not be clogged or irregular in action, as hereinbefore mentioned. Should, however, any such clogging or irregularity take place, the stud will force the roller away from the slide, and travel around with the roller in the groove without causing the shaft Mto be moved by the shaft L. Thus it will be seen that the heads m a? q stud 0 and slide t with their accessories, as explained, constitute a safety attachment to prevent accident to or breakage of the principal parts of the machine in case of some portion thereof becoming clogged or irregular in operation.

For adjusting the nicking-saw 9 into concentricity with its shaft h and confining the saw in place relatively to the shaft, 1 make use of a conic frustum, 00 to screw on the spindle and extend into the eye of the saw, and I screw on the spindle and down upon the saw, while resting onashoulder, y" of the spindle, a chambered nut, 2 to cover the said frustum, such being as shown in Fig. (i. and particularly in Fig. 45 on an enlarged scale.

So, in order to cleanse each blank after i may have been reshaved, I make use of a stationary brush, X, arranged as represented, the blank while being moved away from the reshaving-tool being caused to pass through the said brush and to be cleansed thereby.

I would remark that after a blank may have been threaded and the threader may have left it the jaws for holding it to the action of the threading tool or die open and allow such blank to fall or be discharged from between them.

Before my invention machinery for threading a screw-blank, for shaving, reshaving, and nickin g its head, and for transferrin g the blank from the shaving and nicking mechanisms to the threading mechanism has been known and in use; but with such there has not been combined, as in my machine, hereinbefore described, a curved born or adjuster and mechanism for moving the blank on and lengthwise across such curved horn, so as to reverse the blank or turn it end for end and properly adjust it for being threaded, the blank while passing over or along the horn having its head in contact with the horn, whereby the blank is moved in the transferrer by the horn while such blank is being reversed in moving along the horn, such curved horn o'r adjuster being shown at V, while the blank-transferrer to operate with it is represented at T in the drawings.

Having thus described my said machine, what I claim as of my invention may be stated as follows 1. In combination with mechanism for threading a screw-blank and mechanism for shaping and nicking its head, mechanism for transferring the blank from thelatter to the former of the said mechanisms, and reversing or turning it end for end and properly adjusting it in the meantime, in manner as described, for being received into the jaws of the threading mechanism.

2. The combination of the adjuster U, substantially as set forth, with the transferrer T, having mechanism for moving it, as described, relatively to such adjuster.

3. The combination of a hopper and mechanism for feeding the screw-blanks successively therefrom with mechanism for shaping and nicking the head of each blank, mechanism for threading the shank of the blank, and mechanism for transferring the blank from the mechanism for shaping its head to the threading mechanism, and reversing or turning the said blan-k end for end, and properly adjustin g it in the meantime, as described, forbeing received into the jaws of the threading mechanism.

4. The combination of the four spindles provided with jaws and mechanism for opening and closing them, as described, and also with mechanism for imparting to such spindles not only an intermittent orbital motion about their common axis, but intermittent rotary motions on their own axes, as set forth, with the screwblank-head shaving, nicking, and reshavin g mechanisms, mechanism for holding the blank by its head while its shank is being threaded, mechanism for screw-threading the blank, and mechanism for transferring such blank, in manner as described, from one of the spindles of the series thereof to the jaws or mechanism for supporting said blank while being threaded, and during such transfer reversing the blank and adjusting it, as set forth, for its head to be received by such jaws, all being substantially as shown and described.

5. The combination of the four spindles provided with jaws and mechanism for opening and closing them, as described, and also with mechanism for imparting to such spindles not only an intermittent orbital motion about their common axis, but intermittent rotary motions on their own axes, as set forth, with the screwblank-head shaving, nicking, and reshaving mechanisms, mechanism for holding the blank by its head while its shank is being threaded, mechanism for screw-threading the blank, mechanism for trimming the end of the shank of the blank, and mechanism for transferring,

' in manner as described, such blank from one of the spindles of the seriesthereof to the jaws or mechanism for supporting such blank while being threaded, and during such transfer reversing the blank and adjusting it, as explained, for its head to be received by such jaws, all being essentially as set forth.

6. The combination for intermittingly revolving the spindles, it consisting of the driving-pulley k endless band i sliding and rotary pulleys f F, auxiliary loose pulley h M, and the spindle-pulleys 9 all being arranged and applied substantially as set forth.

7. The combination applied to the shafts M and I for intermittingly revolving, the said shaft 1 and its series of spindles, such combination consisting of thecam p, stud q, sectoral lever r, gear 8, stud o, perforated wheel w, furcated lever Z, arm a, shaft 0', arms 0 o, toggles p q, pitman r, bent lever s, and cam a, all being adapted'and arranged substantially as set forth.

8. The combination, with the spindle-carrying shaft I and the shaft 0, having mechan' ism for operating them, as described, of mechanism for causing the endless belt 6 to pass from two of the spindle-pulleys to the two auxiliary pulleys k or from the pulleys k to two of the pulleys 1 as occasion may require, such mechanism consisting of the rod (0?, head 3 sleeve 0 and screw 61 arranged with and adapted to the shafts I and 0, essentially as set forth.

9. In combination with the head D and with the series of spindles provided with jaws, as explained, and with mechanisms for nicking and shaving the heads of the screw-blanks and transferring them, as described, to machinery for threading them, the slider r having mechanism for operating it, as specified,

such slider being not only to introduce the screw-blank between the jaws of a spindle,

its pinion and the operative rack b of the latter, of the slide-rod and the two helical springs 61 0, arranged as set forth.

12. The combination of the adjustable stops m m with the head E and with the transferrer provided with the stud l and with the pinion 9 rack b springs d a, and rod 0, for operating such transferrer relatively to the stops, as specified.

13. The combination, with the shafts L and M, of the mechanism which, in case of clogging or irregularity in action of the mechanism bywhich the blanks are shaped and nicked or otherwise treated, as described, will operate to prevent breakage or accident, as mentioned, such mechanism being the heads m n stud 0 grooved head (1 slide it and its adj listing-screw 12 and roller a, all adapted and arranged as set forth.

WILLIAM H. EDDY.

Witnesses:

R. H. EDDY, S. N. PIPER.

Ioo 

